Developing my Java IDE, I need to find an autocomplete feature. Perhaps there is some kind of open source repository or can you somehow pull this mechanism out of Android Studio? Who in the autocomplete tank is an autocompletion function when typing, for example, when we write Str under the cursor, a window appears with options for autocompletion ( String , StringBuilder , etc.)

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    Excuse me, but either I’m not at all in the topic of problems of programmers in Java or the self-compiler itself is the least of the problems and if you have already solved the remaining problems, this part of the complexity should not be for you .... =) visibility of variables, these problems you have solved? - Vladimir Klykov
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    @Flippy because it is very, very, very difficult, and many (and not one) people have been working on it for several years, and professionals. An ASE-level ASE alone, and even smart, will most likely not be developed (sorry, if that). And besides, writing programs on a smartphone is a tin, believe me. More precisely, it is impossible to develop a program on a smart. - Anton Sorokin
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    @Flippy all the more, than you are not satisfied with the many already made IDE? Example - play.google.com/store/apps/… - Anton Sorokin
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    @ Vladimir Klykov okay, mouse and keyboard - you can safely carry them with you, but what about the monitor? Some kind of portable, but with a normal (in size) screen? - Regent
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    @Regent but fortunately, such IDEs are already a bunch, and Flippy will not have to do its own :). And if he doesn’t like the IDE functionality, then this code, for example, is on GitHub, and he can finish everything he wants. - Anton Sorokin

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As you know, AS is just a reworked IntelliJ. The answer to the question is most likely in the source code of IntelliJ IDEA . Most likely - here .

This Android IDE seems to have an autocomplite. Here is her page on github.